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Membrane crystallization of sodium carbonate for carbon dioxide recovery: Effect of impurities on the crystal morphology

机译：碳酸钠的膜结晶用于二氧化碳回收：杂质对晶体形态的影响

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Membrane contactors have been proposed as an advanced tool for CO_ 2 capture from flue gases by absorption in alkaline solutions. However, regeneration of the alkaline reagent and further CO_2 sequestration are pending issues. In this paper, membrane-assisted crystallization is proposed for crystallizing Na_2CO_3, which allows its reuse, after CO_2 absorption from flue gases. Due to the presence of compounds other than CO_2 in flue gases (i.e., SO_ 2, NO_x), other compounds (Na_2SO_4 and NaNO_3) may interfere with Na_2CO_3 crystallization. This was evaluated by measuring the flux through the membrane and the morphology, crystallography, and purity of the crystals. Furthermore, the presence of NaCl possibly transferred from the osmotic solution to the feed solution was evaluated. The experimental results indicate that the presence of impurities decreases the flux through the membrane due to the decrease of water activity, although there is no influence on the overall mass transfer coefficient. The presence of Na_2SO_4 affected the morphology of the Na_2CO_3 crystals while NaNO_3 and NaCl had no apparent effect on the crystalline products. It was confirmed that Na_2CO_3·10H_2O was formed during the crystallization. Moreover, the purity of Na_2CO_3 crystals reaches up to ca. 99.5%. Membrane-assisted crystallization was concluded to be feasible in recovering CO_2 as a carbonate salt, which can possibly be reused in the industry.
机译：膜接触器已经被提出作为通过在碱性溶液中吸收从烟气中捕获CO_2的先进工具。然而，碱性试剂的再生和进一步的CO 2隔离是未决的问题。本文提出了膜辅助结晶法来结晶Na_2CO_3，使其在烟气中吸收了CO_2后可以重复使用。由于烟道气中存在CO_2以外的其他化合物（即SO_2，NO_x），其他化合物（Na_2SO_4和NaNO_3）可能会干扰Na_2CO_3的结晶。通过测量通过膜的通量以及晶体的形态，晶体学和纯度进行评估。此外，评估了可能从渗透溶液转移到进料溶液中的NaCl的存在。实验结果表明，尽管对总传质系数没有影响，但由于水活度的降低，杂质的存在会降低通过膜的通量。 Na_2SO_4的存在影响了Na_2CO_3晶体的形貌，而NaNO_3和NaCl对晶体产物没有明显影响。确认在结晶过程中形成了Na_2CO_3·10H_2O。此外，Na_2CO_3晶体的纯度高达约。 99.5％。结论是膜辅助结晶对于回收作为碳酸盐的CO_2是可行的，可以在工业中重复使用。

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